/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
This is a helper function used in automated testing, I'm not sure how useful it will be to gamecode or blueprints
[FActiveGameplayEffectHandle](API\Plugins\GameplayAbilities\FActiveGameplayEffectHandle) ApplyGameplayEffectToTarget ( [UGameplayEffect](API\Plugins\GameplayAbilities\UGameplayEffect) * GameplayEffect, [UAbilitySystemComponent](API\Plugins\GameplayAbilities\UAbilitySystemComponent) * Target, float Level, [FGameplayEffectContextHandle](API\Plugins\GameplayAbilities\FGameplayEffectContextHandle) Context, [FPredictionKey](API\Plugins\GameplayAbilities\FPredictionKey) PredictionKey )